<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>float</title>
	<style>
		.box{
			width: 200px;
			height: 200px;
			background: green;
		}
		.box:nth-child(1){
/*			float: left;
*/			background: blue;
		}
		.box:nth-child(2){
			float: left;
			background: red;
		}
		.box:nth-child(3){
			/*float: left;*/
			background: green;
		}
	</style>
</head>
<body>
	<div class="box"></div>
	<div class="box"></div>
	<div class="box"></div>
</body>
</html>